<template>
  <div class="mytree" style="padding-left: 60px">
    <el-switch  v-if="isAuth('generator:pfaccategory:save')" v-model="draggable" active-text="开启拖拽" inactive-text="关闭拖拽"></el-switch>
    <el-button size="mini" v-if="draggable && isAuth('generator:pfaccategory:save')" @click="batchSave">批量保存</el-button>
    <el-button size="mini" v-if="isAuth('generator:pfaccategory:delete')" type="danger" @click="batchDelete">批量删除</el-button>
    <el-tree
      :data="menus"
      :props="defaultProps"
      :expand-on-click-node="false"
      show-checkbox
      node-key="id"
      :default-expanded-keys="expandedKey"
      :draggable="draggable"
      :allow-drop="allowDrop"
      @node-drop="handleDrop"
      ref="menuTree"
    >
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button v-if="node.level <=2 && isAuth('generator:pfaccategory:save')" type="text" size="mini" @click="() => append(data)">添加</el-button>
          <el-button v-if="isAuth('generator:pfaccategory:update')" type="text"  size="mini" @click="edit(data)">编辑</el-button>
          <el-button
            v-if="node.childNodes.length==0 && isAuth('generator:pfaccategory:delete')"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >删除</el-button>
        </span>
      </span>
    </el-tree>

    <el-dialog
      :title="title"
      :visible.sync="dialogVisible"
      width="30%"
      :close-on-click-modal="false"
    >
      <el-form :model="category">
        <el-form-item label="分类名称">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input v-model="category.productUnit" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  // import引入的组件需要注入到对象中才能使用
  components: {},
  props: {},
  data() {
    return {
      pCid: [],
      draggable: false,
      updateNodes: [],
      maxLevel: 0,
      title: "",
      dialogType: "", //edit,add
      category: {
        name: "",
        pid: 0,
        catLevel: 0,
        showStatus: 1,
        sort: 0,
        productUnit: "",
        icon: "",
        id: null
      },
      dialogVisible: false,
      menus: [],
      expandedKey: [],
      defaultProps: {
        children: "children",
        label: "name"
      }
    };
  },
  //计算属性 类似于data概念
  computed: {},
  //监控data中的数据变化
  watch: {},
  //方法集合
  methods: {
    getMenus() {
      this.$http({
        url: this.$http.adornUrl("/generator/pfaccategory/list/tree"),
        method: "get"
      })
        .then(({ data }) => {   //{ data } 解构
          this.menus = data.data;
        })
        .catch(() => {});
    },
    batchDelete() {
      let ids = [];
      let checkedNodes = this.$refs.menuTree.getCheckedNodes();
      // console.log("被选中的元素", checkedNodes);
      for (let i = 0; i < checkedNodes.length; i++) {
        ids.push(checkedNodes[i].id);
      }
      this.$confirm(`是否批量删除【${ids}】菜单?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning"
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/generator/pfaccategory/delete"),
            method: "post",
            data: this.$http.adornData(ids, false)
          }).then(({ data }) => {
            this.$message({
              message: "菜单批量删除成功",
              type: "success"
            });
            this.getMenus();
          });
        })
        .catch(() => {});
    },
    batchSave() {
      this.$http({
        url: this.$http.adornUrl("/generator/pfaccategory/update/sort"),
        method: "post",
        data: this.$http.adornData(this.updateNodes, false)
      })
        .then(({ data }) => {
          this.$message({
            message: "菜单顺序等修改成功",
            type: "success"
          });
          //刷新出新的菜单
          this.getMenus();
          //设置需要默认展开的菜单
          this.expandedKey = this.pCid;
          this.updateNodes = [];
          this.maxLevel = 0;
          // this.pCid = 0;
        })
        .catch(() => {});
    },
    handleDrop(draggingNode, dropNode, dropType, ev) {
      // console.log("handleDrop: ", draggingNode, dropNode, dropType);
      //1、当前节点最新的父节点id
      let pCid = 0;
      let siblings = null;
      if (dropType == "before" || dropType == "after") {
        pCid =
          dropNode.parent.data.id == undefined
            ? 0
            : dropNode.parent.data.id;
        siblings = dropNode.parent.childNodes;
      } else {
        pCid = dropNode.data.id;
        siblings = dropNode.childNodes;
      }
      this.pCid.push(pCid);
      //2、当前拖拽节点的最新顺序，
      for (let i = 0; i < siblings.length; i++) {
        if (siblings[i].data.id == draggingNode.data.id) {
          //如果遍历的是当前正在拖拽的节点
          let catLevel = draggingNode.level;
          if (siblings[i].level != draggingNode.level) {
            //当前节点的层级发生变化
            catLevel = siblings[i].level;
            //修改他子节点的层级
            this.updateChildNodeLevel(siblings[i]);
          }
          this.updateNodes.push({
            id: siblings[i].data.id,
            sort: i,
            pid: pCid,
            catLevel: catLevel
          });
        } else {
          this.updateNodes.push({ id: siblings[i].data.id, sort: i });
        }
      }
      //3、当前拖拽节点的最新层级
      // console.log("updateNodes", this.updateNodes);
    },
    updateChildNodeLevel(node) {
      if (node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          var cNode = node.childNodes[i].data;
          this.updateNodes.push({
            id: cNode.id,
            catLevel: node.childNodes[i].level
          });
          this.updateChildNodeLevel(node.childNodes[i]);
        }
      }
    },
    allowDrop(draggingNode, dropNode, type) {
      //1、被拖动的当前节点以及所在的父节点总层数不能大于3
      //1）、被拖动的当前节点总层数
      //
      this.countNodeLevel(draggingNode);
      //当前正在拖动的节点+父节点所在的深度不大于3即可
      let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;
      // console.log("深度：", deep);
      //   this.maxLevel
      if (type == "inner") {
        // console.log(
        //   `this.maxLevel：${this.maxLevel}；draggingNode.data.catLevel：${draggingNode.data.catLevel}；dropNode.level：${dropNode.level}`
        // );
        return deep + dropNode.level <= 3;
      } else {
        return deep + dropNode.parent.level <= 3;
      }
    },
    countNodeLevel(node) {
      //找到所有子节点，求出最大深度
      if (node.childNodes != null && node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          if (node.childNodes[i].level > this.maxLevel) {
            this.maxLevel = node.childNodes[i].level;
          }
          this.countNodeLevel(node.childNodes[i]);
        }
      }
    },
    edit(data) {
      this.dialogType = "edit";
      this.title = "修改分类";
      this.dialogVisible = true;
      //发送请求获取当前节点最新的数据
      this.$http({
        url: this.$http.adornUrl(`/generator/pfaccategory/info/${data.id}`),
        method: "get"
      })
        .then(({ data }) => {
          //请求成功
         //  console.log("要回显的数据", data.pFacCategory.name);
          this.category.name = data.pFacCategory.name;
          this.category.id = data.pFacCategory.id;
          this.category.icon = data.pFacCategory.icon;
          this.category.productUnit = data.pFacCategory.productUnit;
          this.category.pid = data.pFacCategory.pid;
          this.category.catLevel = data.pFacCategory.catLevel;
          this.category.sort = data.pFacCategory.sort;
          this.category.showStatus = data.pFacCategory.showStatus;
        })
        .catch(() => {});
    },
    append(data) {
      this.dialogType = "add";
      this.title = "添加分类";
      this.dialogVisible = true;
      this.category.pid = data.id;
      this.category.catLevel = data.catLevel * 1 + 1;
      this.category.id = null;
      this.category.name = "";
      this.category.icon = "";
      this.category.productUnit = "";
      this.category.sort = 0;
      this.category.showStatus = 1;
    },
    submitData() {
      if (this.dialogType == "add") {
        this.addCategory();
      }
      if (this.dialogType == "edit") {
        this.editCategory();
      }
    },
    //修改三级分类数据
    editCategory() {
      var { id, name, icon, productUnit } = this.category;
      this.$http({
        url: this.$http.adornUrl("/generator/pfaccategory/update"),
        method: "post",
        data: this.$http.adornData({ id, name, icon, productUnit }, false)
      })
        .then(({ data }) => {
          this.$message({
            message: "菜单修改成功",
            type: "success"
          });
          //关闭对话框
          this.dialogVisible = false;
          //刷新出新的菜单
          this.getMenus();
          //设置需要默认展开的菜单
          this.expandedKey = [this.category.pid];
        })
        .catch(() => {});
    },
    //添加三级分类
    addCategory() {
      this.$http({
        url: this.$http.adornUrl("/generator/pfaccategory/save"),
        method: "post",
        data: this.$http.adornData(this.category, false)
      })
        .then(({ data }) => {
          this.$message({
            message: "菜单保存成功",
            type: "success"
          });
          //关闭对话框
          this.dialogVisible = false;
          //刷新出新的菜单
          this.getMenus();
          //设置需要默认展开的菜单
          this.expandedKey = [this.category.pid];
        })
        .catch(() => {});
    },
    remove(node, data) {
      var ids = [data.id];
      this.$confirm(`是否删除【${data.name}】菜单?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning"
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/generator/pfaccategory/delete"),
            method: "post",
            data: this.$http.adornData(ids, false)
          }).then(({ data }) => {
            this.$message({
              message: "菜单删除成功",
              type: "success"
            });
            //刷新出新的菜单
            this.getMenus();
            //设置需要默认展开的菜单
            this.expandedKey = [node.parent.data.id];
          });
        })
        .catch(() => {});
    }
  },
  //生命周期 - 创建完成（可以访问当前this实例）
  created() {
    this.getMenus();
  },
  //生命周期 - 挂载完成（可以访问DOM元素）
  mounted() {},
  beforeCreate() {}, //生命周期 - 创建之前
  beforeMount() {}, //生命周期 - 挂载之前
  beforeUpdate() {}, //生命周期 - 更新之前
  updated() {}, //生命周期 - 更新之后
  beforeDestroy() {}, //生命周期 - 销毁之前
  destroyed() {}, //生命周期 - 销毁完成
  activated() {} //如果页面有keep-alive缓存功能，这个函数会触发
};
</script>
<style >

.el-tree .el-tree-node__expand-icon.expanded {
  -webkit-transform: rotate(0deg);
  transform: rotate(0deg);
}
.el-tree .el-icon-caret-right:before {
  content: "\e723";
  font-size :16px;
  color :#1389BC;
}
.el-tree .el-tree-node__expand-icon.expanded.el-icon-caret-right:before{
  content: "\e722";
  font-size :16px;
  color: #1389BC;
}

</style>
